I tried the white strips once, as an experiment, and they caused me such intense pain (the nerves within the teeth) that I never used them again.

Just as an aside, we did an experiment at work where we each (four of us) created monocultures of our oral bacteria (and then identified them) and tested the efficacy of everyone's toothpaste in inhibiting biofilm formation (biofilms are what you would consider plaque... what rots your teeth). For every brand we tested, the whitening formulas (often with hydrogen peroxide as the active ingredient) were the least effective in preventing biofilm formation.

My dentist had an offer where new patients got free whitening, so I have some bleaching trays. I've used them twice (for a week at a time, not individual uses) but I think the last time was last winter, so it's been a while. Maybe I'll do it again over my Christmas break. It's a bit of a hassle when I'm busy.

i did use the crest whitestrips for sensitive teeth - they did work. not to the extent of the regular because the sensitive wasn't as strong. but i use the crest 3d whitening toothpaste and that keeps everything clean and shiny - and advanced listerine plus

I tried the white strips once, as an experiment, and they caused me such intense pain (the nerves within the teeth) that I never used them again.

Just as an aside, we did an experiment at work where we each (four of us) created monocultures of
...

I tried the white strips once, as an experiment, and they caused me such intense pain (the nerves within the teeth) that I never used them again.

Just as an aside, we did an experiment at work where we each (four of us) created monocultures of our oral bacteria (and then identified them) and tested the efficacy of everyone's toothpaste in inhibiting biofilm formation (biofilms are what you would consider plaque... what rots your teeth). For every brand we tested, the whitening formulas (often with hydrogen peroxide as the active ingredient) were the least effective in preventing biofilm formation.

My Mom used to work as a dentist (it was her first education), so she's quite aware of these products and always recommends me to stay away from them. I have rather sensitive teeth and don't want to damage my enamel.